Data transmission systems

Details Data transmission systems Data transmission systems

1978-07-31

1980-09-30

Stewart, David L.

Multiplex communications

Wide area network

Packet switching

370 13, 370 86, H04J 308

Patent

active

042257530

ABSTRACT:
In a closed-loop multiple data terminal data transmission system, each message includes in addition to a message portion, a prefix portion having at least the address of the terminal for which the message is intended. When such a message reaches a data terminal its address is checked, and if not for that terminal, the prefix and the message portions are repeated along the loop. If the message is for the terminal only the prefix is repeated along the loop, the message portion being retained at the intended terminal. The prefix with no attached message eventually reaches the originating data terminal where its arrival indicates that the message has reached its destination and that the loop is intact.

REFERENCES:
patent: B497293 (1976-03-01), Mattern
patent: 3600518 (1961-08-01), McNeilly
patent: 3600519 (1971-08-01), McNeilly
patent: 3652798 (1972-03-01), McNeilly
patent: 4079209 (1978-03-01), Schwerdtel

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